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Joint operations (Joint operations proportionate interest in net assets table) (Details) - CAD ($)
$ in Thousands
 12 Months Ended
May 19, 2022
Dec. 31, 2022
Dec. 31, 2021
Disclosure of joint operations [line items]      
Total assets   $ 8,632,793 $ 7,517,744
Joint operations [member]      
Disclosure of joint operations [line items]      
Total assets   2,745,245 2,854,340
Total liabilities   $ 328,730 349,779
McArthur River [Member]      
Disclosure of joint operations [line items]      
Ownership   69.81%  
Principal place of business   Canada  
Total assets   $ 998,368 1,010,956
Total liabilities   $ 37,881 36,697
Key Lake [Member]      
Disclosure of joint operations [line items]      
Ownership   83.33%  
Principal place of business   Canada  
Total assets   $ 527,841 549,051
Total liabilities   $ 240,487 267,579
Cigar Lake [Member]      
Disclosure of joint operations [line items]      
Ownership   54.55%  
Principal place of business   Canada  
Total assets   $ 1,219,036 1,294,333
Total liabilities   $ 50,362 $ 45,503
Cigar Lake [Member] | Before acquiring additional interest in Joint Venture [Member]      
Disclosure of joint operations [line items]      
Ownership 50.025%    
Cigar Lake [Member] | Idemitsu [Member]      
Disclosure of joint operations [line items]      
Participating interest held in Joint Venture 7.875%